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Builders FirstSource BLDR

US equityMarket cap rank #1914
$55.63 −$0.62 (-1.10%)
Market closed · Oct 5, 10:50 pm ET · Last extended-hours $55.75 +0.22%
Open$56.49
Prev close$56.25
Day range$54.99 – $56.99
Volume2.96M
Market cap$5.99B
P/E (TTM)60.5
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Short interest8.28% of floatDays to cover 3.4 · as of 15 Sep 2026
Short-sale volume share15.6%5-day average of daily volume

Short-sale volume as % of daily volume

10%12%15%17%Sep '26Sep '26Oct '26

Reported short interest has risen from 7.07% to 8.28% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 8,907,075 8.3% 3.4
31 Aug 2026 7,829,223 7.3% 4.4
14 Aug 2026 7,264,682 6.8% 3.8
31 Jul 2026 8,013,450 7.4% 3.1
15 Jul 2026 7,200,190 6.7% 3.6
30 Jun 2026 7,603,336 7.1% 2.9

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